HTC Desire User Manual page 278

78 Security
To change your unlock screen pattern, press HOME
then tap Settings > Security > Change unlock pattern.
When you fail to draw the correct unlock pattern on the screen after
five attempts, you will be prompted to wait for 0 seconds before you
can try again. If you forgot your screen unlock pattern, tap Forgot
pattern. You will be prompted to sign in using your Google Account
name and password, and create a new screen unlock pattern before
the Home screen displays.
You need to be connected to a data or Wi-Fi connection to be able to
sign in to your Google Account.
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